Results of a district spelling bee for both girls and boys

Assignment Help Basic Statistics
Reference no: EM13104286

The results of a district spelling bee for both girls and boys are normally distributed. the 60 girls have a mean score of 71 with a standard deviation of 6, while the 50 boys have a mean score of 66 points with standard deviation of 5 points. Those students with a score greater than 75 are eligible to go to the state spelling bee contest. How many girls are going to the state contest?

Reference no: EM13104286

Questions Cloud

Population having normal distribution : A population is Normally distributed and has a σ =24. Samples of size 25 have a sample mean of 100. Find the 90% confidence interval for the population mean.
At what angle will the electron be traveling : An electron is accelerated horizontally from rest in a television picture tube by a potential difference of 5500V. It then passes between two horizontal plates 6.5cm long and 1.3 cm apart that have a potential difference of 250V. At what angle wil..
Determine the effect of business ethics in the culture : Purpose statement of study was study the Business Ethics by know method and effect in culture. Also, support that by some theories and some case of study.
By what factor does energy stored in electric field change : A parallel-plate capacitor has fixed charges +Q and -Q. The separation of the plates is then doubled. (a) By what factor does the energy stored in the electric field change? (b) How much work must be done in doubling the plate separation from d to..
Results of a district spelling bee for both girls and boys : The results of a district spelling bee for both girls and boys are normally distributed. the 60 girls have a mean score of 71 with a standard deviation of 6, while the 50 boys have a mean score of 66 points with standard deviation of 5 points.
Confidence interval-hypothesis test : In a 1993 survey of 560 college students, 171 said that they used illegal drugs during the previous year. In a recent survey of 720 college students, 263 said that they used illegal drugs during previous year.
What is the direction of the electric field : An electron is released from rest in a uniform electric field and accelerates to the north at a rate of 180m/s^2. What is the magnitude of the electric field in (N/C)? What is the direction of the electric field?
Statistical analysis-sat scores : A random sample of 225 SAT scores has a mean of 1522. Assume that SAT scores have a population standard deviation of 300. construct a 95% confidence interval estimate of the mean SAT scores.
What volume of water, in acre-feet : Hydraulic engineers often use, as a unit of volume of water, the "acre-foot", defined as the volume of water that will cover 1 acre of land to a depth of 1 ft. A severe thunderstorm dumps 3.0 in. of rain in 30 min on a town of area 30 km2. What vo..

Reviews

Write a Review

Basic Statistics Questions & Answers

  Null hypothesis of equal mean rates for a type-i error rate

Assume that p-value was 0.07, would you reject null hypothesis of equal mean rates for a Type- I error rate of 5%? (Circle one).

  Evaluate p-value of the chi-square test of this hypothesis

Suppose we wish to test the null hypothesis that there are no differences among the proportion of men and women who developed a rash. Evaluate the P-value of the chi-square test of this hypothesis.

  Question on probability with replacement

3 voters are randomly selected (with replacement) from a group of 1,500 people. The group is known to be 20% republican. What is the probability that all of them are republicans?

  Hypotheses to determine the perfect adjustment

Formulate the hypotheses to determine whether or not the lathe is in perfect adjustment.

  Mean values at two different time points

The information is reported below. Is it reasonable to conclude the percent is less now than five years ago?

  Random variables to measure level of interest

A company is conducting a survey of 235 people to measure the level of interest in a new product. Assume that the probability of a randomly selected person's being "very interested" is 0.88

  Decision regarding observed and expected frequencies

What is our decision regarding differences between observed and expected frequencies if critical value of chi-square is 9.488 and computed value is 6.079.

  State the experimental and null hypotheses

Create an research question, and then state the experimental and null hypotheses. Then, explain why null and alternative hypotheses have to be mutually exclusive. Finally, discuss how Type I and Type II errors are related to your hypotheses.

  Testing the claim by using the drug experienced relief

In a clinical study of an allergy drug, 108 of the 203 subjects reported experiencing significant relief from their symptoms. Using a significance level of .01, test the claim that more than half of all those using the drug experienced relief.

  What is the random variable of interest

Suppose a social worker is involved in a study about family structure. She obtains information regarding the number of children per family in a certain community from the census data. What is the random variable of interest? Is the random variable..

  Testing hypothesis using level of significance

Assume a business researcherwishes to test hypothesis that greater proportion of marketing managers keep track of such obligations.

  Showing decision rule graphically

Show the decision rule graphically. Use the .05 significance level.

Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd